. A practical treatise on diseases of the skin, for the use of students and practitioners . ts structure ; the outer,called the horny layer or stratum corneum ; a layer interveningbetween this and the deepest, known as the stratum lucidum ;and lastly, next to the true skin, the mucous layer or stratummueo-um. Like the entire integument, the epidermis differsin thickness in different portions of the body, that over thepalms and soles being greatly superior in vertical section to theepidermis which covers the dorsum of these same organs andthat found in yet more sensitive situations, as in the l
. A practical treatise on diseases of the skin, for the use of students and practitioners . ts structure ; the outer,called the horny layer or stratum corneum ; a layer interveningbetween this and the deepest, known as the stratum lucidum ;and lastly, next to the true skin, the mucous layer or stratummueo-um. Like the entire integument, the epidermis differsin thickness in different portions of the body, that over thepalms and soles being greatly superior in vertical section to theepidermis which covers the dorsum of these same organs andthat found in yet more sensitive situations, as in the lids, lips,temples, and prepuce. The Horsy Later, or Stratum Corneum of the epidermis, is relatively the largest of the three, and is made up of superim-posed Beriee of flat, imbricated, many sided, dryish and whitishepidermal plates, uniformly and closely packed together, whichare spindle shaped on vertical section. They are unprovided THE EPIDERMIS. 19 with bloodvessels, pigment or nuclei, though according to Heitz-raaun a nucleus is often faintly indicated in the lower portion Fig. Vertical section of the skin of the thumb, partly diagrammatic. «., stratum corneum, traversedby ducts of two glands ; b, rete mucosum with prolongations extending between papillae beneath ;between a and b is seen the stratum lucidum ; c, papillary layer of corium. Near the centreof the figure is seen a nervous papilla ; d, reticular layer of corium with vascular plexus, nucle-ated connective tissue and interspaces ; e, coils of four sweat-glands ; /, fat-globules in the meshesof the connective tissue. of the stratum corneum. The outermost plates are more wrin-kled and curled than those which are typically flattened andseen in the deeper portions, being also in such situations com- ■20 ANATOMY AND PHYSIOLOGY OF THE SKIN. pletely lifeless, and moreover proportionately destitute of lilthey me found at a greater distance from the rete. The exactsource of these bodies has not been determined. Th
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